COSMOS Wide-Depth Stacks (PDR2)

Partly for photo-z calibration purposes, we have stacked a subset of the UltraDeep-COSMOS data to the Wide-depth.  Using the large number of visits taken in the field, we generated stacks with three different seeing sizes.  Specifically, we set the target seeing at the 25, 50, and 75th percentiles of the seeing distributions in the Wide layer for each filter.  The exact seeing sizes in arcsec are summarized in the table below. These three stacks are available in separate database schema.  Because the individual exposure times in UltraDeep are longer than those in Wide, we stacked only 2 and 4 visits for gr and izy, respectively.  As a result, the gaps between the CCDs are not fully filled and this may limit the use of the wide-depth stacks.

stack g r i z y
best 0.63 0.61 0.52 0.70 0.59
median 0.74 0.79 0.57 0.75 0.73
worst 0.87 0.89 0.67 0.83 0.94